If the principles of socialism have not international application and if the socialist movement is not an international movement then its whole philosophy is false and the movement has no reason for existence.
Karl Marx, founder of the modern socialist movement, based his whole theory upon the internationality of the working class and called upon the workers of all countries to unite in the struggle for their emancipation.
Before the war broke out in Europe there was no question about the international character of the socialist movement, but when the tocsin sounded, international obligation was swept away, or forgotten, and in the frenzy aroused by the military clackers, thousands of socialist party members became the intensest of nationalists and “patriots,” utterly denying their international principles and obligations and turning traitors to the movement to which they had solemnly pledged their honor and their lives.
If the international socialist movement is to be organized on a bedrock foundation, if it is to endure in the future, instead of collapsing as in the past; if, in a word, it is to give expression and direction to the social revolution, it can only be by a rigid observance of the fundamental principles of internationalism and upon the sound basis of the class struggle.
True socialists cannot at the same time be nationalists, militarists, and capitalist “patriots.” They are either one or the other; they cannot be both. The self-called socialists who are nationalists first and who set the “fatherland” of their masters above the whole earth and above all the workers of the world are not socialists at all but either mild and harmless capitalist reformers and stool pigeons or traitors to the cause.
THE SOCIALIST MOVEMENT IF IT STANDS AT ALL MUST STAND UNFLINCHINGLY AND UNCOMPROMISINGLY FOR SOCIALIST INTERNATIONALISM VERSUS CAPITALIST NATIONALISM!
Upon that rock it can stand against the world; upon that rock it can withstand the shock of war, and all the powers of capitalism and hell cannot prevail against it.
We must get rid of nationalism, militarism, and the kind of “patriotism” which is responsible for the socialists of Europe now drenching the soil of the “fatherland” of their masters with the blood of comrades, and we must beware lest nationalism get a foothold in the party here in the United States, for as certain as it does, the party will go the way of the socialist parties of the old world which have been all but destroyed by its vicious and disrupting influence.